brahmic_scripts.gv

 digraph brahmicscripts {

#Thai
     Kumer->Thai;

#Kumer
#     Kumer->Thai;
     Kumer->Lao;
     Pallava->Kumer;

#Pallava
     Brahmi->Pallava;

#Brahmi
     Brahmi->Gupta;
#     Brahmi->Pallava;

#Gupta
     Gupta->Nāgarī;
     Gupta->Śāradā;
     Gupta->Siddham;

#Nāgarī
     Nāgarī->Devanāgarī;
     Nāgarī->Nandināgarī;

#Devanāgarī
     Devanāgarī->Gujarati;
     Devanāgarī->Modī;
     Devanāgarī->Ranjana;
#Ranjana
     Ranjana->Soyombo;

#Śāradā
     Śāradā->Gurmukhī;
     Śāradā->Takri;
     Śāradā->Landa;

#Siddham
     Siddham->Assamese;
     Siddham->Bengali;
     Siddham->Tibetan;

#Bengali
     Bengali->Tirhuta;

#Tibetan
     Tibetan->Limbu;
     Tibetan->Lepcha;
     Tibetan->Phagspa;

#Lepcha
     Lepcha->Limbu;

#Phagspa
     Phagspa->Hangul;
}

c_perl_php_cpp.gv

digraph language {

#C-language
     B->C;
     ALGOL->C;
     Assembly->C;
     pascal->C;

     C->AWK;
     C->csh;
     C->CPP;
     C->ObjectiveC
     C->D;
     C->Java;
     C->JavaScript;
     C->Limbo;

#Perl
     AWK -> Perl;
     BASICPLUS -> Perl;
     C -> Perl;
     CPP -> Perl;
     LISP -> Perl;
     Pascal -> Perl;
     sed -> Perl;
     Shellscript -> Perl;

     Perl -> JavaScript;
     Perl -> PHP;
     Perl -> Python;
     Perl -> Ruby;
     Perl -> PowerShell;

#PHP
     C -> PHP;
     CPP  -> PHP;
     Java -> PHP;
#     Perl -> PHP;
     Tcl -> PHP;

#C++
#     C->CPP;
     Simula->CPP;
     Ada->CPP;

     CPP->Java;
     CPP->CSharp;
     CPP->D;
#     CPP->PHP;
 }

perl.gv

digraph language {
     AWK -> Perl;
     BASICPLUS -> Perl;
     C -> Perl;
     CPP -> Perl;
     LISP -> Perl;
     Pascal -> Perl;
     sed -> Perl;
     Shellscript -> Perl;

     Perl -> JavaScript;
     Perl -> PHP;
     Perl -> Python;
     Perl -> Ruby;
     Perl -> PowerShell;
 }